1、BSI Standards PublicationMethodology for communication networkdependability assessmentand assuranceBS EN 62673:2013National forewordThis British Standard is the UK implementation of EN 62673:2013. It is identical to IEC 62673:2013.The UK participation in its preparation was entrusted to TechnicalCom
2、mittee DS/1, Dependability.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 201
3、3.Published by BSI Standards Limited 2013ISBN 978 0 580 79004 1ICS 03.120.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 September 2013.Amendments/corrigenda
4、 issued since publicationDate Text affectedBRITISH STANDARDBS EN 62673:2013EUROPEAN STANDARD EN 62673 NORME EUROPENNE EUROPISCHE NORM August 2013 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische N
5、ormung CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62673:2013 E ICS 03.120.01 English version Methodology for communication network dependability assessme
6、nt and assurance (IEC 62673:2013) Mthodologie pour lvaluation et lassurance de la sret de fonctionnement des rseaux de communication (CEI 62673:2013) Methodik zur Beurteilung und Sicherstellung der Zuverlssigkeit von Kommunikationsnetzen (IEC 62673:2013) This European Standard was approved by CENELE
7、C on 2013-07-23. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards
8、 may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language an
9、d notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Ger
10、many, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 62673:2013EN 62673:2013 - 2 - Foreword The text of document 56/1507/FDIS, fut
11、ure edition 1 of IEC 62673, prepared by IEC/TC 56 “Dependability“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62673:2013. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national
12、standard or by endorsement (dop) 2014-04-23 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-07-23 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall n
13、ot be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62673:2013 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for
14、the standards indicated: IEC 61078 NOTE Harmonised as EN 61078. IEC 62198 NOTE Harmonised as EN 62198. IEC 60812 NOTE Harmonised as EN 60812. IEC 60300-3-11 NOTE Harmonised as EN 60300-3-11. IEC 60300-3-1 NOTE Harmonised as EN 60300-3-1. IEC 61165 NOTE Harmonised as EN 61165 BS EN 62673:2013- 3 - EN
15、 62673:2013 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the editi
16、on cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60050-19
17、1 International Electrotechnical Vocabulary (IEV) - Chapter 191: Dependability and quality of service - - IEC 60300-3-15 Dependability management - Part 3-15: Application guide - Engineering of system dependability EN 60300-3-15 IEC 61907 Communication network dependability engineering EN 61907 BS E
18、N 62673:2013 2 62673 IEC:2013 CONTENTS INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms, definitions and abbreviations 7 Terms and definitions 7 3.1Abbreviations 11 3.24 Overview of network dependability methodology . 11 Need for network dependability methods . 11 4.1Network dependabi
19、lity objectives . 12 4.2Network service scenarios . 13 4.3Network dependability assessment strategies 13 4.4Network dependability assurance strategies 14 4.55 Network dependability methodology applications 15 Network life cycle process . 15 5.1Life cycle process applications 15 5.1.1Risk assessment
20、process applications . 15 5.1.2Dependability methodology applications 16 5.1.3Network dependability performance characteristics . 17 5.2Network dependability assessment methodology . 18 5.3Generic dependability analysis and evaluation techniques . 18 5.3.1Service scenario analysis 19 5.3.2Network mo
21、delling . 19 5.3.3Network failure modes, effects and criticality analysis . 20 5.3.4Network fault insertion test 21 5.3.5Failure reporting, analysis and corrective action system 22 5.3.6Network dependability assurance methodology . 22 5.4Scope of dependability assurance methodology applications . 22
22、 5.4.1Assurance of dependability of service 23 5.4.2Assurance of data integrity 23 5.4.3Assurance of network performance functions and support process 5.4.4enhancement . 24 Network dependability assurance methods 24 5.4.5Annex A (informative) Example of E2E network dependability assessment 27 Annex
23、B (informative) Example of full-end network dependability assessment . 33 Annex C (informative) Evaluation of network dependability performance in field operation 35 Bibliography 37 Figure A.1 A typical example of an E2E network topology 27 Figure B.1 A typical example of a full-end network topology
24、 . 33 Figure C.1 Network outage contributions and resultant network service impact 36 BS EN 62673:201362673 IEC:2013 3 Table 1 Summary of network dependability activities and application methods . 17 Table 2 Summary of network dependability parameters 18 Table C.1 Summary of network failure data of
25、a nation-wide public switched telephone network 35 BS EN 62673:2013 6 62673 IEC:2013 INTRODUCTION Communication network dependability is highly influenced by the design and implementation of the network service functions, which aim to achieve user satisfaction in service performance. Network evoluti
26、on, service growth and functional renewal in communications have long been challenges to the providers of network services, not just for the broad range of services now in existence, but also for those service-related activities experienced by the end-users. To sustain viable business in network ser
27、vices, it is prudent for the communications industry to provide the needed network service functions, adequate network capacity and performance capability, security of service, quality of service, and dependability of service. This International Standard addresses one of the most important issues co
28、ncerning the assessment and delivery of dependability of service to ensure network service performance. It also addresses the network dependability assurance strategies and methodology applications for enhancing and sustaining network operation. This International Standard describes a generic method
29、ology for dependability assessment and assurance of communication networks. It also provides relevant assessment and assurance methods to support communication networks for dependability engineering application, such as those conforming to IEC 61907 and ITU-T1Recommendations concerning dependability
30、. It presents an approach for network dependability analysis and evaluation that ensures dependable network design for effective implementation. The objective of this standard is to achieve a cost-effective solution for realizing the network dependability performance and to assure the benefits from
31、the network dependability of service operation. _ 1ITU-T: International Telecommunications Union Telecommunications. BS EN 62673:201362673 IEC:2013 7 METHODOLOGY FOR COMMUNICATION NETWORK DEPENDABILITY ASSESSMENT AND ASSURANCE 1 Scope This International Standard describes a generic methodology for d
32、ependability assessment and assurance of communication networks from a network life cycle perspective. It presents the network dependability assessment strategies and methodology for analysis of network topology, evaluation of dependability of service paths, and optimization of network configuration
33、s in order to achieve network dependability performance and dependability of service. It also addresses the network dependability assurance strategies and methodology for application of network health check, network outage control and test case management to enhance and sustain dependability perform
34、ance in network service operation. This standard is applicable to network service providers, network designers and developers, and network maintainers and operators for assurance of network dependability performance and assessment of dependability of service. 2 Normative references The following doc
35、uments, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-191, Internati
36、onal Electrotechnical Vocabulary (IEV) Chapter 191: Dependability and quality of service IEC 60300-3-15, Dependability management Part 3-15: Application guide Engineering of system dependability IEC 61907, Communication network dependability engineering 3 Terms, definitions and abbreviations Terms a
37、nd definitions 3.1For the purposes of this document, the terms and definitions given in IEC 60050-191 and IEC 61907, as well as the following, apply. 3.1.1communication network system of communication nodes and links that provides transmission of analogue and digital signals EXAMPLES Telecommunicati
38、ons networks, Internet, intranet, extranet, Wide Area Networks (WAN), Local Area Networks (LAN) and computer networking utilizing information technology. Note 1 to entry: A network has its boundary. All nodes at the network boundary are called ends. In some applications, the term “node” is used inst
39、ead of “end” as a communication access point to the network, as well as for interconnections between the transmission links. Note 2 to entry: A “backbone” communication network consists of core network and high-speed transmission lines (national or international), connecting between major switching
40、network nodes (interconnection of transmission lines) at various locations in a country or region. BS EN 62673:2013 8 62673 IEC:2013 3.1.2dependability network dependability ability to perform as and when required to meet specified communication and operational requirements 3.1.3availability network
41、 availability ability to be in a state to perform as required Note 1 to entry: Availability depends upon the combined characteristics of the reliability, recoverability and maintainability of the network and on the maintenance support performance. Note 2 to entry: Availability may be quantified usin
42、g appropriate performance measures. 3.1.4reliability network reliability ability to perform as required, without failure, for a given time interval, under given conditions Note 1 to entry: The time interval duration may be expressed in units appropriate to the network concerned. Note 2 to entry: Rel
43、iability of a network depends upon the combined characteristics of the reliability, recoverability, maintainability and maintenance support performance of the constituent network elements. Note 3 to entry: Given conditions include aspects that affect reliability, such as: mode of operation, stress l
44、evels, environmental conditions, and maintenance. Note 4 to entry: Reliability may be quantified using appropriate performance measures. 3.1.5maintainability network maintainability ability to be retained in, or restored to a state to perform as required under given conditions of use and maintenance
45、 Note 1 to entry: Given conditions include aspects that affect maintainability, such as: location for maintenance, accessibility, maintenance procedures and maintenance resources. Note 2 to entry: Maintainability may be quantified using appropriate performance measures. 3.1.6maintenance support netw
46、ork maintenance support provision of resources to maintain a network Note 1 to entry: Resources include human resources, support equipment, materials and spare parts, maintenance facilities, documentation, information and maintenance information systems. 3.1.7maintenance support performance network
47、maintenance support performance effectiveness of an organization in respect of maintenance support for the network Note 1 to entry: Maintenance support performance may be quantified using appropriate measures. 3.1.8recoverability network recoverability ability to recover from a failure, without corr
48、ective maintenance Note 1 to entry: The ability to recover may or may not require external actions. BS EN 62673:201362673 IEC:2013 9 Note 2 to entry: Recoverability may be quantified using such measures as the probability of recovery within a specified time interval. 3.1.9element network element sub
49、system or component of a communication network EXAMPLES Terminals, nodes and switches. Note 1 to entry: A network element may involve human input to perform its service function. Note 2 to entry: Network elements are connected by network links. 3.1.10link network link electrical, wireless or optical connection between network nodes 3.1.11performance network performance ability to provide the service functions related to communications between users SOURCE: ITU-T Recommendation I.350:1
